de S. Almeida, C., 		Pires, C., & 		Schiel, U.
(2011).
 Trajectories Data Warehouse: a Model with Support for Aggregation by Direction of Movements.
In <em>Proceedings of the 7th Brazilian Symposium on Information Systems</em>, (pp. 57-68). Porto Alegre: SBC.
doi:10.5753/sbsi.2011.14565